A telescope has an objective lens of 10cm diameter and is situated at a distance of one kilometre from two objects. Find out the minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å.
0.5 m
5 m
5 mm
5 cm
The refractive index of the material of the prism is √3, then the angle of minimum deviation of the prism is :
30°
45°
60°
75°
A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in diopters of the combination is :
25
50
infinite
zero
Electromagnetic radiation of frequency v frequency, velocity v and wavelength λ, in air enters a glass slab of refracive index μ. The frequency, wavelength and velocity of light in the glass slab will be, respectively
Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is is
2 × 10-4s
2 × 108s
2 × 10-11s
2 × 1011s
2 convex lenses
2 concave lenses
1 convex, 1 concave lens
1 convex and 1 plane mirror
A lens is placed between a source of light and a wall. It forms images of area A1 and A2 on the wall, for its two different positions, the area of the source of light is
One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is
0.4
0.8
1.2
1.6
Diameter of human eye lens is 2mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50m from eye? [The wavelength of light is 5000 Å]
2.32 m
4.28 mm
1.25 cm
12.48 cm
Which of the following phenomenon is not common to sound and light waves?
Interference
Diffraction
Coherence
Polarisation
